JPH07145784A - Number of rainwater pump operation controlling method - Google Patents

Abstract

PURPOSE:To keep a pump well water level within an appropriate range by predicting the inflow of rainwater from a precipitation, attempting the unification of the operation time/the reduction of the frequency of starting a pump by conducting the forestalling operation of the pump. CONSTITUTION:The inflow flow of rainwater after a predetermined time is predicted from a precipitation by means of an inflow flow predicting means 2, and a pump well prediction water level is sought from difference with a real water raising quantity QO by means of a prediction water level operating means 4, and on the other hand, pump combination that realizes water raising most suitable for an inflow flow is selected by means of a pump selecting means 9, and a pump to be started or stopped is decided and controlled by means of a pump controlling means 7 on the basis of the present pump operation information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater drainage pump control system installed in a sewage treatment site or a rainwater pumping station.

[0002]

2. Description of the Related Art Conventionally, in pump operation control of a sewage treatment plant or a rainwater pumping station in rainy weather, generally, a number-of-pumps operation control system based on the water level of a pump well has been adopted. That is, as shown in FIG. 4, the pump well water level is determined as the start / stop index of each pump and the number of pumps is controlled, and the water level and the start / stop of the pump are fixed in a 1: 1 relationship.

That is, in FIG. 4, H ₁ , H ₂ , and H ₃ are the starting water levels of the No. 1, No. 2, and No. 3 pumps, L ₁ , L ₂ , and L, respectively.
₃ shows the No. 1, No. 2, No. 3 pump stop level as well.

[0004]

In the number-of-units control method based on the water level as shown in FIG. 4, since the control index is only the water level,
It is difficult to properly control the fluctuation of the amount of inflow water, and the number of pump starts increases and the pump operating time becomes uneven. Therefore, in some cases, the vehicle may be driven manually, and although it is called automatic, it requires a human hand.

The present invention has been made in view of the above problems, and by predicting the inflow of rainwater and operating the pump in advance, the number of times of starting the pump is reduced and the operating time is made uniform. It is an object of the present invention to provide a rainwater pump operation number control method that keeps the pump well water level within an appropriate range.

[0006]

A first aspect of the present invention is a rainwater pump operation number control system for pumping rainwater flowing into a pump well to a sewage treatment facility by a plurality of different-capacity pumps. Inflow rate predicting means for predicting the inflow rate of rainwater after a predetermined time to the well, actual pumping rate calculating means for calculating the pumping rate by inputting the current pump operation information, and the predicted inflow rate and actual pumping rate Difference between the water level fluctuation and the current pump well water level input information to calculate the predicted water level, and a pump combination that enables pumping that best matches the predicted inflow rate is selected as pump selection information. Means for selecting a pump to be stored, and a predicted water level for generating a pump control command when the predicted water level is outside the control upper limit water level and lower limit water level of the pump well And a pump control means for determining a pump to be started or stopped based on the pump selection information and the current pump operation input information when the pump control command is received, and sending a start or stop signal to the pump. To be done.

On the other hand, in the second invention, in the rainwater pump operation number control system in which rainwater flowing into the pump is pumped to the sewage treatment equipment by a plurality of pumps having the same capacity, rainfall amount information is input and a predetermined time to the pump well is entered. Inflow rate predicting means for predicting the inflow rate of the subsequent rainwater, actual pumping rate calculating means for calculating the pumping rate by inputting the current pump operation information, and water level which is the difference between the predicted inflow rate and the actual pumping rate. Predicted water level calculation means that calculates the predicted water level based on the amount of fluctuation and the current pump well water level input information, and control the pump well control of the predicted water level. Predictive water level determination means for generating a pump control command for stopping when rotating, and start or stop based on the current pump operation input information when the pump control command for starting or stopping is received. Composed of pump control means for sending a start or stop signal to the pump to determine the can pump.

[0008]

First, in the operation of the first aspect of the invention, the predicted inflow rate after a predetermined time is calculated for each predetermined time based on the rainfall amount information input to the inflow rate prediction means based on a known inflow rate prediction method.

On the other hand, the actual pumping amount is calculated from the sum of the pump capacities based on the current pump operation information input to the actual pumping amount calculating means. The predicted inflow rate and the actual pumping rate are input to the predicted water level calculation means, the difference in flow rate is calculated, the water level fluctuation amount is calculated in consideration of the pump well area, and the sum of the current pump well water level input information is calculated. And calculate the predicted water level of the pump well. On the other hand, in the pump selection means, a pump combination that enables pumping that best matches the predicted inflow rate is selected from the sum of the pump capacities and stored as pump selection information. With the predicted water level determination means, it is determined whether or not the predicted water level is within the control upper / lower limit water level of the pump well,
At the time of deviation from the range, a pump control command is sent to the pump control means, the pump to be started or stopped is determined from the pump selection memory information and the current pump operation input information, and a start or stop signal is sent to the pump. Send out.

Next, in the operation of the second aspect of the present invention, the predicted inflow rate after a predetermined time is calculated for each predetermined time based on the rainfall information input to the inflow rate prediction means based on a known inflow rate prediction method. On the other hand, the actual pumping amount is calculated from the sum of the pump capacities based on the current pump operation information input to the actual pumping amount calculation means. The predicted inflow rate and the actual pumping rate are input to the predicted water level calculation means to obtain the flow rate fluctuation of the difference, the water level fluctuation amount is calculated in consideration of the pump well area, and the sum of the current pump well water level input information is calculated. Calculate the predicted water level in the pump well. The predicted water level determination means determines whether the predicted water level is within the control upper / lower limit water level of the pump well and starts pumping when the water level exceeds the upper water level and stops when the water level falls below the lower water level. Send to the means. Upon receiving the command, the pump control means determines the pump to be started or stopped based on the current pump operation input information, and sends a start or stop signal to the pump.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a system configuration diagram.
Is an input / output unit for inputting rainfall amount information R, pump well water level information H, pump operation information P _G, etc., and outputting start S _K or stop signal S _T to the pump. Reference numeral 2 denotes an inflow flow rate predicting means, which calculates a predicted inflow flow rate Q _IY of rainwater after a predetermined time (5 to 15 minutes) to the pump well based on the rainfall amount information R. Reference numeral 3 is an actual pumping amount calculation means, which calculates the actual pumping amount Q _O by the pump based on the current pump operation information P _{G. Reference numeral} 4 is a predictive water level calculation means, which is the inflow flow rate Q _IY.
And the predicted water level H _Y of the pump well after a predetermined time is calculated based on the actual pumped water quantity Q _O and the pump well water level information H. 5
Is a predictive water level determining means, which determines whether or not the predictive water level H _Y is within the control upper / lower limit water level (CHL, CCL) of the pump well. Emit. _{Reference numeral} 6 denotes a pump selection means, which selects a pump combination that enables pumping that is most suitable for the predicted inflow flow rate Q _IY and stores it as pump selection information P _S. 7
Is the pump control means, and the current pump operation information P _G
And inputs the said pump selection information P _S, upon receiving the pump control command S, to determine the pump to be activated or stopped, activation signal S _K or stop signal via the input-output unit 1 to the pump Send S _T.

Next, the operation of this embodiment will be described. Various information sent from the site is taken in via the input / output means 1, the rainfall amount information R is input to the inflow rate prediction means 2, and the current pump operation information P _G is the actual pumped water amount calculation means 3 and the pump control means 7. The current pump well water level information H is input to the predicted water level calculation means 4.

First, in the inflow flow rate predicting means 2, a predetermined inflow flow rate Q _IY after a predetermined time, for example, 5 to 15 minutes, is determined based on the modified RRL method of the known technique most commonly used for the sewer inflow estimation. It is calculated for each time and sent to the predicted water level calculation means 4 and the pump selection means 6.

On the other hand, the actual pumping amount calculation means 3 calculates the current actual pumping amount Q _O from the sum of the pump discharge amounts during each operation, based on the current pump operating information P _G.

Next, in the predicted water level calculation means 4, the difference Q _IY between the previously calculated predicted inflow rate Q _IY and the actual pumped water quantity Q _O.
-Calculating the flow rate fluctuation amount ± ΔQ _IY at the time of prediction from Q _O, the water level fluctuation amount ± ΔH _Y at the time of prediction is calculated from ± ΔQ _IY / A in consideration of the pump well area A. Therefore, the predicted water level H _Y of the pump well is calculated from the sum H ± ΔH _{Y of} the current pump well water level information H and the water level fluctuation amount ± ΔH _Y.

On the other hand, the pump selection means 6 selects a pump combination that enables pumping that is most suitable for the previously calculated predicted inflow rate Q _IY from the sum of the pump capacities, and the pump selection information P _S at the time of prediction Remember as.
Meanwhile predicted water level H _Y of pump well calculated earlier, the control upper limit water level CHL and control lower limit level C of the pump well shown in FIG. 2
Whether it is maintained within the range of CL, that is, CCL <H _Y
<CHL is constantly monitored by the predicted water level determination means 5,
A pump control command S is issued when the water level deviates from the lower limit water level.
Upon receiving the pump control command S, the pump control means 7 determines the pump to be started or stopped based on the pump selection information P _S and the current pump operation information P _G stored in the pump selection means 7, and A start signal S _K or a stop signal S _T is sent to the pump via the input / output means 1.

In the case of controlling the number of operating machines by using pumps having the same capacity, the system can be simplified as shown in the system configuration diagram of FIG. That is, in the prediction level judgment means 5 excludes pump selecting means 6 in FIG. 1, a pump control command start when the predicted water level H _Y deviates a control upper limit water level CHL, predicted water level H _Y
Sends a pump control command to the pump control means 7 to stop when the control deviates from the control lower limit water level CCL. When the pump control means 7 receives the start or stop pump control command, it determines the pump to be started or stopped based on the current pump operation information P _G, and sends the start or stop signal to the input / output means 1 to the pump. Send through.

[0018]

As described above, the present invention predicts the inflow rate from the rainfall amount and selects the optimum pump combination, while
When the predicted water level calculated from the difference between the predicted inflow flow rate and the current pump capacity deviates from the limit water level, it switches to the optimum pump combination. Can fit in.
Further, the number of pump starts can be reduced as compared with the conventional method, and the pump operation time can be made uniform. Further, it has an excellent effect that the combined operation of pumps having different pumping capacities, which cannot be achieved by the conventional control method, can be appropriately performed.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

[Figure 2] Pump well water level diagram

FIG. 3 is a system configuration diagram showing another embodiment of the present invention.

[Fig. 4] Conventional pump number control pattern diagram

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Input / output means 2 ... Inflow flow rate prediction means 3 ... Actual pumped water amount calculation means 4 ... Predicted water level calculation means 5 ... Predicted water level determination means 6 ... Pump selection means 7 ... Pump control means CHL ... Control upper limit water level CCL ... Control lower limit water level

Claims (2)

[Claims] 1. In a rainwater pump operating number control system in which rainwater flowing into a pump well is pumped by a plurality of pumps of different capacities, rainfall amount information is input to predict the flow rate of rainwater flowing into the pump well after a predetermined time. Inflow rate predicting means, actual pumping volume calculation means for calculating pump pumping volume by inputting current pump operation information, water level fluctuation amount which is a difference between the predicted inflowing flow rate and the actual pumping rate, and the current pump Predicted water level calculation means for calculating the predicted water level based on the well water level input information, pump selection means for selecting a pump combination that enables pumping that is most suitable for the predicted inflow rate and storing it as pump selection information, and the predicted water level is Control of the pump well: A predictive water level determination means for determining whether or not the water level is within the upper and lower water level limits and issuing a pump control command when the water level deviates from the range, and the pump control command A rainwater pump characterized by comprising pump control means for deciding a pump to be started or stopped based on the pump selection information and the current pump operation input information and sending a start or stop signal to the pump when received. Operating number control system. 2. In a rainwater pump operation number control system in which rainwater flowing into a pump well is pumped by a plurality of pumps having the same capacity, rainfall information is input to predict the flow rate of rainwater flowing into the pump well after a predetermined time. Inflow rate predicting means, actual pumping volume calculation means for inputting the current pump operation information to calculate the pumping rate, and water level fluctuation amount which is the difference between the predicted inflow rate and the actual pumping rate and the current pump Predicted water level calculation means for calculating the predicted water level from the well water level input information, and it is determined whether the predicted water level is within the control upper limit water level and lower limit water level of the pump well. Predictive water level determination means for generating a pump control command for stopping when the water level falls below the water level, and starting or stopping based on the current pump operation input information when the pump control command for starting or stopping is received. Rainwater pump operation number control system determines the pump was characterized by including a pump control means for sending a start or stop signal to the pump to.